The already solid Humble Indie Bundle 7 has added three more titles to its line-up: The Basement Collection, Offspring Fling, and Cave Story+. Should you have already purchased the bundle, these games are now yours at no extra cost; new buyers will have to beat the average contribution amount, currently hovering under a mere seven bucks.
If you don't own most of these already, this package is a must buy. And even if you do, consider being the awesome person who gives out unneeded Steam keys to others. I once again find the Cave Story theme song stuck in my head. What a terrific problem to have.